The UK release included a different theme, of world geography with each destination in a different continent, in "Birds on Vacation".
It is mentioned in Joni Savage's character profile that she has a pet anaconda named Jupiter, but her pet has never made an appearance in any of the games in the franchise.
It is revealed that Joni Savage has an uncle by the name of Dr. Horace Pythagoras whom is abducted in the game's cutscene upon starting the game. While Joni's parents are not shown in the series, Dr. Pythagoras would be considered her maternal uncle due to differing last names.
Leslie Clark whom is in the 6th grade (alongside Owen Lam) is described in her character profile having skipped a grade, but it was never revealed which grade she particularly skipped before entering 6th grade.
On rare occasions, after the player creates his/her file, the clues in the Monkey Kingdom after solving the puzzles to build bridges to cross each ring of fire to enter the cavern featuring a painting of a Numerian person to find one of the two Lost Keys will require the player to hit the spear twice while normally they click the different parts of the body of the painting of a Numerian person only once while in order.